HV9921/HV9922/HV9923

3-Pin Switch-Mode LED Lamp Driver ICs

1

NR092005

Initial Release

Features

Constant Output Current:

o

HV9921 – 20mA

o

HV9922 – 50mA

o

HV9923 – 30mA

Universal 85-264VAC Operation

Fixed OFF-Time Buck Converter

Internal 500V Power MOSFET

Applications

Decorative Lighting

Low Power Lighting Fixtures

General Description

The HV9921/22/23 are pulse width modulated (PWM)

high-efficiency LED driver control ICs. They allow efficient

operation of LED strings from voltage sources ranging up

to 400VDC. The HV9921/22/23 include an internal high

voltage switching MOSFET controlled with fixed off-time T

OFF

of approximately 10

µs. The LED string is driven at constant

current, thus providing constant light output and enhanced

reliability. The output current is internally fixed at 20mA for

HV9921, 50mA for HV9922, and 30mA for the HV9923. The

peak current control scheme provides good regulation of the

output current throughout the universal AC line voltage range

of 85 to 264VAC or DC input voltage of 20 to 400V.

Typical Application Circuit

HV9921/22/23